There’s what is stated and what is implied. In the absence of any sort of formal or “official” organization, participants get to choose their own level of involvement.

I often refer to “birthstrike” as a conceptually similar and related group.

It’s to protect against pregnancy in an environment where women’s rights have been eroded.

If Project 2025 takes away abortion rights and even contraceptives, sex becomes a really big risk.

Part of 4B is to avoid pregnancy, especially in an environment that has banned abortions and restricted contraceptives (e.g. Project 2025).